Loading Your Library only once between WordPress Plugins | https://www.ibenic.com/loading-library-once-wordpress-plugins/

load_latest.php

<?php

class Library_Integration {

  // previous code here ...
  
  /**
   * Load latest Library path
   */
  public static function load_latest_path() {
    // Composer will load it.
    if ( ! isset( $GLOBALS[ $this->name ] ) ) {
      return;
    }
    
    if ( ! $GLOBALS[ $this->name ] || ! is_array( $GLOBALS[ $this->name ] ) ) {
      return;
    }
    
    $latest = '0.0.0';
    foreach ( $GLOBALS[ $this->name ] as $version => $path ) {
      if ( version_compare( $latest, $version, '<' ) ) {
        $latest = $version;
      }
    }

    if ( isset( $GLOBALS[ $this->name ][ $latest ] ) && file_exists( $GLOBALS[ $this->name ][ $latest ] ) ) {
      include_once $GLOBALS[ $this->name ][ $latest ];
    }
  }

}

register.php

<?php

class Library_Integration {

  // previous code here ...
  
  /**
   * Register Library Version on the $GLOBALS
   */
  public function register_version() {
    if ( ! isset( $GLOBALS[ $this->name ] ) ) {
      $GLOBALS[ $this->name ] = array();
    }

    if ( isset( $GLOBALS[$this->name ][ $this->version ] ) ) {
      return;
    }
    
    $GLOBALS[ $this->name ][ $this->version ] = $this->get_path();
  }

}